●Product Size (W x H x D): Approx. 1.4 x 1.5 x 3.7 inches (36 x 37 x 95 mm) (excluding bracket); Compatible Size (Handlebar Φ 0.7 - 10.0 inches (19.0 ●Set Weight: Approx. 2.0 oz (55 g) (including bracket); Set Includes: Main unit, 1 bracket, 1 non-slip pad ●Materials: Body/Lens: Polycarbonate, Bracket: Polyacetal ●Specifications: Power supply: DC 4.5 V *Requires 3 AAA batteries (sold separately), Light source: 3 high-intensity white LEDs, Battery life (when using alkaline batteries), Illumination = about 40 hours continuously, Flashing = about 60 hours continuously, depending on usage conditions ●Country of Origin: China